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from pypy.interpreter.error import OperationError, oefmt
from pypy.interpreter.gateway import WrappedDefault, unwrap_spec
from rpython.rlib.rarithmetic import intmask
from rpython.rlib import rstackovf, jit
from pypy.objspace.std.marshal_impl import marshal, _unmarshallers_unroll, FLAG_REF
#
# Write Python objects to files and read them back. This is primarily
# intended for writing and reading compiled Python code, even though
# dicts, lists, sets and frozensets, not commonly seen in code
# objects, are supported. Version 3 of this protocol properly
# supports circular links and sharing. The previous version is called
# "2", like in Python 2.7, although it is not always compatible
# between CPython 2.7 and CPython 3.4. Version 4 adds small
# optimizations in compactness.
#
# XXX: before py3k, there was logic to do efficiently dump()/load() on
# a file object. The corresponding logic is gone from CPython 3.x, so
# I don't feel bad about killing it here too.
#
Py_MARSHAL_VERSION = 4
@unwrap_spec(version=int)
def dump(space, w_data, w_f, version=Py_MARSHAL_VERSION):
"""Write the 'data' object into the open file 'f'."""
# same implementation as CPython 3.x.
w_string = dumps(space, w_data, version)
space.call_method(w_f, 'write', w_string)
@unwrap_spec(version=int)
def dumps(space, w_data, version=Py_MARSHAL_VERSION):
"""Return the string that would have been written to a file
by dump(data, file)."""
m = StringMarshaller(space, version)
m.dump_w_obj(w_data)
return space.newbytes(m.get_value())
def load(space, w_f):
"""Read one value from the file 'f' and return it."""
reader = FileReader(space, w_f)
try:
u = Unmarshaller(space, reader)
return u.load_w_obj()
finally:
reader.finished()
def loads(space, w_str):
"""Convert a string back to a value. Extra characters in the string are
ignored."""
return _loads(space, w_str)
def _loads(space, w_str, hidden_applevel=False):
u = StringUnmarshaller(space, w_str, hidden_applevel=hidden_applevel)
obj = u.load_w_obj()
return obj
class AbstractReaderWriter(object):
def __init__(self, space):
self.space = space
def raise_eof(self):
space = self.space
raise oefmt(space.w_EOFError, "EOF read where object expected")
def finished(self):
pass
def read(self, n):
raise NotImplementedError("Purely abstract method")
def write(self, data):
raise NotImplementedError("Purely abstract method")
class FileReader(AbstractReaderWriter):
def __init__(self, space, w_f):
AbstractReaderWriter.__init__(self, space)
try:
self.func = space.getattr(w_f, space.newtext('read'))
# XXX how to check if it is callable?
except OperationError as e:
if not e.match(space, space.w_AttributeError):
raise
raise oefmt(space.w_TypeError,
"marshal.load() arg must be file-like object")
def read(self, n):
space = self.space
w_ret = space.call_function(self.func, space.newint(n))
ret = space.bytes_w(w_ret)
if len(ret) < n:
self.raise_eof()
if len(ret) > n:
raise oefmt(space.w_ValueError,
"read() returned too much data: "
"%d bytes requested, %d returned",
n, len(ret))
return ret
class _Base(object):
def raise_exc(self, msg):
space = self.space
raise OperationError(space.w_ValueError, space.newtext(msg))
class Marshaller(_Base):
"""
atomic types including typecode:
atom(tc) puts single typecode
atom_int(tc, int) puts code and int
atom_int64(tc, int64) puts code and int64
atom_str(tc, str) puts code, len and string
building blocks for compound types:
start(typecode) sets the type character
put(s) puts a string with fixed length
put_short(int) puts a short integer
put_int(int) puts an integer
put_pascal(s) puts a short string
put_w_obj(w_obj) puts a wrapped object
put_tuple_w(TYPE, tuple_w) puts tuple_w, an unwrapped list of wrapped objects
"""
def __init__(self, space, writer, version):
self.space = space
## self.put = putfunc
self.writer = writer
self.version = version
self.all_refs = {}
# all_refs = {w_obj: index} for all w_obj that are of a
# "reasonably sharable" type. CPython checks the refcount of
# any object to know if it is sharable, independently of its
# type. We can't do that. We could do a two-pass marshaller.
# For now we simply add to this list all objects that marshal to
# more than a few fixed-sized bytes, minus ones like code
# objects that never appear more than once except in complete
# corner cases.
## currently we cannot use a put that is a bound method
## from outside. Same holds for get.
def put(self, s):
self.writer.write(s)
def put1(self, c):
self.writer.write(c)
def atom(self, typecode):
#assert type(typecode) is str and len(typecode) == 1
# type(char) not supported
self.put1(typecode)
def atom_int(self, typecode, x):
a = chr(x & 0xff)
x >>= 8
b = chr(x & 0xff)
x >>= 8
c = chr(x & 0xff)
x >>= 8
d = chr(x & 0xff)
self.put(typecode + a + b + c + d)
def atom_int64(self, typecode, x):
self.atom_int(typecode, x)
self.put_int(x>>32)
def atom_str(self, typecode, x):
self.atom_int(typecode, len(x))
self.put(x)
def start(self, typecode):
# type(char) not supported
self.put(typecode)
def put_short(self, x):
a = chr(x & 0xff)
x >>= 8
b = chr(x & 0xff)
self.put(a + b)
def put_int(self, x):
a = chr(x & 0xff)
x >>= 8
b = chr(x & 0xff)
x >>= 8
c = chr(x & 0xff)
x >>= 8
d = chr(x & 0xff)
self.put(a + b + c + d)
def put_pascal(self, x):
lng = len(x)
if lng > 255:
self.raise_exc('not a pascal string')
self.put(chr(lng))
self.put(x)
def put_w_obj(self, w_obj):
marshal(self.space, w_obj, self)
def dump_w_obj(self, w_obj):
space = self.space
try:
self.put_w_obj(w_obj)
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
self._overflow()
def put_tuple_w(self, typecode, lst_w, single_byte_size=False):
self.start(typecode)
lng = len(lst_w)
if single_byte_size:
self.put(chr(lng))
else:
self.put_int(lng)
idx = 0
while idx < lng:
w_obj = lst_w[idx]
marshal(self.space, w_obj, self)
idx += 1
def _overflow(self):
self.raise_exc('object too deeply nested to marshal')
class StringMarshaller(Marshaller):
def __init__(self, space, version):
Marshaller.__init__(self, space, None, version)
self.buflis = [chr(0)] * 128
self.bufpos = 0
def put(self, s):
pos = self.bufpos
lng = len(s)
newpos = pos + lng
while len(self.buflis) < newpos:
self.buflis *= 2
idx = 0
while idx < lng:
self.buflis[pos + idx] = s[idx]
idx += 1
self.bufpos = newpos
def put1(self, c):
pos = self.bufpos
newpos = pos + 1
if len(self.buflis) < newpos:
self.buflis *= 2
self.buflis[pos] = c
self.bufpos = newpos
def atom_int(self, typecode, x):
a = chr(x & 0xff)
x >>= 8
b = chr(x & 0xff)
x >>= 8
c = chr(x & 0xff)
x >>= 8
d = chr(x & 0xff)
pos = self.bufpos
newpos = pos + 5
if len(self.buflis) < newpos:
self.buflis *= 2
self.buflis[pos] = typecode
self.buflis[pos+1] = a
self.buflis[pos+2] = b
self.buflis[pos+3] = c
self.buflis[pos+4] = d
self.bufpos = newpos
def put_short(self, x):
a = chr(x & 0xff)
x >>= 8
b = chr(x & 0xff)
pos = self.bufpos
newpos = pos + 2
if len(self.buflis) < newpos:
self.buflis *= 2
self.buflis[pos] = a
self.buflis[pos+1] = b
self.bufpos = newpos
def put_int(self, x):
a = chr(x & 0xff)
x >>= 8
b = chr(x & 0xff)
x >>= 8
c = chr(x & 0xff)
x >>= 8
d = chr(x & 0xff)
pos = self.bufpos
newpos = pos + 4
if len(self.buflis) < newpos:
self.buflis *= 2
self.buflis[pos] = a
self.buflis[pos+1] = b
self.buflis[pos+2] = c
self.buflis[pos+3] = d
self.bufpos = newpos
def get_value(self):
return ''.join(self.buflis[:self.bufpos])
def invalid_typecode(space, u, tc):
u.raise_exc("bad marshal data (unknown type code %d)" % (ord(tc),))
class Unmarshaller(_Base):
hidden_applevel = False
def __init__(self, space, reader):
self.space = space
self.reader = reader
self.refs_w = []
def get(self, n):
assert n >= 0
return self.reader.read(n)
def get1(self):
# the [0] is used to convince the annotator to return a char
return self.get(1)[0]
def save_ref(self, typecode, w_obj):
if typecode >= '\x80':
assert self.refs_w[-1] is None
self.refs_w[-1] = w_obj
def atom_str(self, typecode):
self.start(typecode)
lng = self.get_lng()
return self.get(lng)
def atom_lng(self, typecode):
self.start(typecode)
return self.get_lng()
def start(self, typecode):
tc = self.get1()
if tc != typecode:
self.raise_exc('invalid marshal data')
def get_short(self):
s = self.get(2)
a = ord(s[0])
b = ord(s[1])
x = a | (b << 8)
if x & 0x8000:
x = x - 0x10000
return x
def get_int(self):
s = self.get(4)
a = ord(s[0])
b = ord(s[1])
c = ord(s[2])
d = ord(s[3])
if d & 0x80:
d -= 0x100
x = a | (b<<8) | (c<<16) | (d<<24)
return intmask(x)
def get_lng(self):
s = self.get(4)
a = ord(s[0])
b = ord(s[1])
c = ord(s[2])
d = ord(s[3])
x = a | (b<<8) | (c<<16) | (d<<24)
if x >= 0:
return x
else:
self.raise_exc('bad marshal data')
def get_pascal(self):
lng = ord(self.get1())
return self.get(lng)
def get_str(self):
lng = self.get_lng()
return self.get(lng)
def _get_w_obj(self, allow_null=False):
space = self.space
tc = self.get1()
typecode = ord(tc)
save_ref = bool(typecode & FLAG_REF)
typecode = chr(typecode & ~FLAG_REF)
bad = False
index = len(self.refs_w)
w_ret = None
if save_ref:
self.refs_w.append(None)
for current_tc, func, save_ref_in_func in _unmarshallers_unroll:
if current_tc == typecode:
if save_ref_in_func:
save_ref = False
w_ret = func(space, self, tc)
break
else:
bad = True
if bad:
self.raise_exc("bad marshal data (unknown type code %d)" % (ord(typecode),))
if save_ref:
self.refs_w[index] = w_ret
if w_ret is None and not allow_null:
raise oefmt(space.w_TypeError, "NULL object in marshal data")
return w_ret
def load_w_obj(self, allow_null=False):
try:
return self._get_w_obj(allow_null)
except rstackovf.StackOverflow:
rstackovf.check_stack_overflow()
self._overflow()
except OperationError as e:
if not e.match(self.space, self.space.w_RecursionError):
raise
# somebody else has already converted the rpython overflow error to
# an OperationError (e.g. one of che space.call* calls in
# marshal_impl), turn it into a ValueError
self._overflow()
def get_tuple_w(self, single_byte_size=False):
if single_byte_size:
lng = ord(self.get1())
else:
lng = self.get_lng()
res_w = [None] * lng
idx = 0
space = self.space
w_ret = space.w_None # something not
while idx < lng:
res_w[idx] = self.load_w_obj()
idx += 1
if w_ret is None:
raise oefmt(space.w_TypeError, "NULL object in marshal data")
return res_w
def _overflow(self):
self.raise_exc('object too deeply nested to unmarshal')
class StringUnmarshaller(Unmarshaller):
# Unmarshaller with inlined buffer string
def __init__(self, space, w_str, hidden_applevel=False):
Unmarshaller.__init__(self, space, None)
self.buf = space.readbuf_w(w_str)
self.bufpos = 0
self.limit = self.buf.getlength()
self.hidden_applevel = hidden_applevel
def raise_eof(self):
space = self.space
raise oefmt(space.w_EOFError, "EOF read where object expected")
def get(self, n):
pos = self.bufpos
newpos = pos + n
if newpos > self.limit:
self.raise_eof()
self.bufpos = newpos
return self.buf.getslice(pos, 1, newpos - pos)
def get1(self):
pos = self.bufpos
if pos >= self.limit:
self.raise_eof()
self.bufpos = pos + 1
return self.buf.getitem(pos)
def get_int(self):
pos = self.bufpos
newpos = pos + 4
if newpos > self.limit:
self.raise_eof()
self.bufpos = newpos
a = ord(self.buf.getitem(pos))
b = ord(self.buf.getitem(pos+1))
c = ord(self.buf.getitem(pos+2))
d = ord(self.buf.getitem(pos+3))
if d & 0x80:
d -= 0x100
x = a | (b<<8) | (c<<16) | (d<<24)
return intmask(x)
def get_lng(self):
pos = self.bufpos
newpos = pos + 4
if newpos > self.limit:
self.raise_eof()
self.bufpos = newpos
a = ord(self.buf.getitem(pos))
b = ord(self.buf.getitem(pos+1))
c = ord(self.buf.getitem(pos+2))
d = ord(self.buf.getitem(pos+3))
x = a | (b<<8) | (c<<16) | (d<<24)
if x >= 0:
return x
else:
self.raise_exc('bad marshal data')
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